JP4508965B2 - Valve seal structure - Google Patents

Description

  The present invention relates to a valve seal structure in which a valve body is pressed against a valve seat by the force of fluid to close a flow hole.

  Conventionally, there is an air valve 1 shown in FIGS. 7 and 8 as an example of a valve that closes a flow hole by pressing a valve body against a valve seat by the force of fluid. The air valve 1 has a flange portion 3 for connection to a sewage pipe (not shown) at the lower part of the valve box 2, and a valve box cover 4 at the upper part of the valve box 2. The valve box cover 4 is provided with a valve seat 6 that forms an exhaust hole 5. The valve body 7 that opens and closes the exhaust hole 5 has a diaphragm 8 fixed to the upper end portion of the valve shaft portion 7a, and a lid member 9 having a pressure relief hole 9a to the atmosphere is disposed above the diaphragm 8 so that the valve shaft A pressure chamber 11 communicating with the inside of the valve box 2 through a small-diameter air hole 10 penetrating the portion 7a is formed.

  A float 12 that moves up and down according to the fluctuation of the liquid level and raises and presses the valve body 7 in the closing direction S by buoyancy is disposed inside the valve box 2. The shaft 13 that supports the float 12 is engaged with the pin 15 of the valve body 7 in the long hole 14, and is provided so as to be relatively movable with respect to the valve body 7 in a certain range in the vertical direction. The small diameter air hole 10 is opened and closed by the upper end surface 13a of the shaft 13 coming into contact with and separating from the small diameter air hole valve seat 10a.

  A splash guard 16 is arranged below the valve box cover 4. A vent hole 16 a is formed in the splash guard 16, and a strainer 17 for catching foreign matters such as dust is attached above the vent hole 16 a. . A flapper 18 is provided at the lower end of the float 12.

Next, the operation of the air valve 1 configured as described above will be described.
At the time of filling the pipe, as shown in FIG. 7, the float 12 and the valve body 7 move downward, the valve body 7 is separated from the valve seat 6, and the exhaust hole 5 is opened. A large amount of air is exhausted to the outside through the exhaust hole 5 of the valve box 2.

  When the water filling progresses and the water level inside the valve box 2 rises, as shown in FIG. 8, buoyancy acts on the float 12, the float 12 moves up, and the shaft 13 has a small diameter air hole valve seat at the upper end surface 13a. The small diameter air hole 10 is closed in contact with 10a and the valve body 7 is pushed up, and the valve body 7 is pressed against the valve seat 6 to close the exhaust hole 5.

  When the water in the liquid flowing through the pipe flows into the valve box 2 and accumulates in the interior after the completion of the water filling, the liquid level decreases, and the float 12 moves down due to the decrease in the liquid level. Along with this, the shaft 13 also moves downward, and its upper end surface 13a is separated from the small diameter air hole valve seat 10a to open the small diameter air hole 10. By opening the small-diameter air hole 10, the internal pressure of the valve box 2 acts on the pressure chamber 11 through the small-diameter air hole 10, and a downward force acts on the valve body 7 through the diaphragm 8.

  For this reason, a downward force acting via the diaphragm 8 and an upward force acting due to the internal pressure of the valve box 2 act on the valve body 7, and as shown in FIG. 7 and the weight of the float 12 push down the valve body 7, the valve body 7 is lowered and separated from the valve seat 6, the exhaust hole 5 is opened, and a large amount of air accumulated in the valve box 2 is discharged through the exhaust hole 5. Is done.

  As the air is discharged, the liquid level inside the valve box 2 rises, and when the float 12 moves upward, the shaft 13 closes the small-diameter air hole 10 at the upper end surface 13a and pushes up the valve body 7. The valve body 7 is pressed against the valve seat 6 by closing and closes the exhaust hole 5 and pushes up the diaphragm 8 so that air accumulated in the pressure chamber 11 is discharged through the pressure release hole 9a.

The air valve 1 configured as described above is described in Patent Document 1 below.
However, in the above conventional type, when the air valve 1 is installed in the sewage pipe, the air valve 1 may be installed with a slight inclination with respect to the vertical axis. In this case, the valve seat 6 may be slightly inclined with respect to the valve body 7, and a gap is formed between the valve body 7 and the valve seat 6 in a state where the exhaust hole 5 is closed by the valve body 7. End up. At low pressure, there is a problem that the pressing force of the valve body 7 to the valve seat 6 is small and the gap is not lost, so that the water stoppage is lowered and water leaks from the gap.

  On the other hand, as shown in FIGS. 9 and 10, as shown in FIGS. 9 and 10, an annular seal member 21 is provided on the valve body 7 as a sealing structure for improving the water stoppage between the valve body 7 and the valve seat 6. is there. The upper portion 21a of the seal member 21 is formed in a mountain shape. As shown in FIG. 10, when the valve body 7 is moved upward to close the exhaust hole 5, the upper portion 21a of the seal member 21 is Pressed.

However, in the above seal structure, as shown in FIG. 10, when the exhaust hole 5 is closed, the upper portion 21a of the seal member 21 is in the same direction as the closing direction S of the valve body 7 (that is, the height direction of the seal member 21). Since the compression force is deformed, the downward reaction force of the seal member 21 acting on the valve body 7 is large. For example, when the internal pressure of the valve box 2 is low and the pressing force in the closing direction S of the valve body 7 is small, the seal There is a possibility that the upper part 21a of the member 21 may not be sufficiently compressed, and thus there is a problem that the water stoppage cannot be sufficiently maintained.
Japanese Examined Patent Publication No. 7-65691

  It is an object of the present invention to provide a valve seal structure that can reliably prevent leakage between a valve body and a valve seat and further improve the water stoppage.

In order to achieve the above object, the first invention is a valve seal structure in which a valve body is pressed against a valve seat by the force of a fluid to close a flow hole,
The valve seat is formed so as to surround the circulation hole,
An annular seal member is fitted into a groove formed in either the valve body or the valve seat ,
The seal member has a protrusion that can freely come into contact with and separate from the valve seat or the valve body over the entire circumference.
The protruding portion is inclined to either the outer peripheral side or the inner peripheral side, and is configured to fall to the inclined side when contacting the valve seat or the valve body,
The internal pressure of the valve box acts from the inclined side of the protrusion to the opposite side,
The groove has a wall surface that is located next to the protrusion and faces the protrusion from the side opposite to the internal pressure acting side .

According to this, when the flow hole is closed by the valve body, the protruding portion of the seal member comes into contact with either the valve seat or the valve body and is elastically deformed in the direction of the inclined side and falls down. As a result, even if the valve body and the valve seat are relatively inclined and a gap is generated between the valve body and the valve seat when fully closed, the protrusion of the seal member is Since it is in contact with one of the valve bodies, leakage is prevented and water stoppage is improved.

Further, when fully closed, the protrusion of the seal member is not deformed in the same direction as the closing direction of the valve body but is elastically deformed and falls down in a different specific direction (that is, a direction on the inclined side). For this reason, the reaction force of the seal member acting on the valve body can be reduced, and even when the pressing force in the closing direction of the valve body is small, the protrusion of the seal member easily elastically deforms and falls. This makes it possible to keep the water stopping sufficiently.

In addition, when the protrusion is in contact with either the valve seat or the valve body and falls down, the internal pressure of the valve box acts from the inclined side of the protrusion toward the opposite side, so that the protrusion Is pushed back from the falling direction to the standing direction by the internal pressure. Therefore, as the internal pressure becomes higher, the push-back force acting in the upright direction acting on the protrusion increases, and the push-back force pushes the protrusion more strongly against either the valve seat or the valve body. The self-water stopping function is improved.

In the second invention , a valve seat side seat surface is formed on the valve seat,
The valve body has a valve body side seat surface that can freely come into contact with and separate from the valve seat side seat surface,
The wall surface of the groove is orthogonal to the valve seat side seat surface or the valve body side seat surface .

  As described above, according to the present invention, it is possible to reliably prevent leakage between the valve body and the valve seat to further improve the water stoppage, and to improve the self-waterstop function by the protrusion. it can.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, about the same member as the past, the same code | symbol is attached and description is abbreviate | omitted.
(First embodiment)
As shown in FIG. 1, the seal structure between the valve seat 6 and the valve body 7 of the air valve 1 is configured as follows.

  A valve seat side seat surface 31 is formed on the lower end surface of the valve seat 6 so as to surround the exhaust hole 5 (an example of a flow hole). The valve body 7 has a valve body side seat surface 32 that can approach and separate from the valve seat side seat surface 31 from the orthogonal direction (vertical direction) and that can contact and separate from the valve seat side seat surface 31 from below. is doing.

  An annular seal member 33 is provided on the valve body 7. As shown in FIG. 2, the seal member 33 uses an elastic body such as rubber as a material, and is formed over the entire circumference near the inner periphery of the main body 33a and the upper end (one end) of the main body 33a. And a flange 33c that is formed at the lower portion (the other end portion) of the main body portion 33a and protrudes toward the outer peripheral side.

  The protrusion 33b has a triangular cross-sectional shape in the vertical direction, is inclined toward the outer peripheral side of the seal member 33 (an example of the specific direction A), and is tapered and sharpened toward the upper end. Further, the inner peripheral surface of the protrusion 33b (that is, the surface opposite to the inclined side) is formed as a seal surface 34. The seal surface 34 is inclined outward toward the tip, and the valve seat The side sheet surface 31 can be contacted and separated from below. In addition, the outer peripheral surface of the protrusion 33b is also inclined outward toward the tip.

  As shown in FIG. 1, the said valve body 7 is comprised by the valve body main-body part 7b and the ring-shaped pressing member 7c provided in the outer peripheral part of this valve body main-body part 7b. The pressing member 7c is attached to the valve body main body 7b by a plurality of screws 7d. In the valve body 7, a groove 35 having an open upper portion is formed over the entire circumference by the valve body main body portion 7b and the pressing member 7c. The seal member 33 is fitted into the groove 35 and held by the valve body 7, and the protrusion 33 b protrudes upward from the valve body side seat surface 32 toward the valve seat side seat surface 31.

  The upper surface of the main body portion 33a of the seal member 33 is lowered below the valve body side seat surface 32, whereby a concave space 36 is secured between the upper surface of the main body portion 33a and the valve body side seat surface 32. The

Hereinafter, the operation of the above configuration will be described.
As shown in FIG. 1B, when the valve body 7 is pushed up in the closing direction S, the valve body side seat surface 32 comes into contact with the valve seat side seat surface 31, and the exhaust hole 5 is closed, the seal member 33. The protrusion 33b comes into contact with the valve seat side seat surface 31 and is elastically deformed in the specific direction A (that is, the outer peripheral side) and falls down. As a result, even if the valve body 7 and the valve seat 6 are relatively inclined and a gap is generated between the valve body 7 and the valve seat 6 when fully closed, the seal of the projection 33b as described above. Since the surface 34 is in contact with the valve seat side seat surface 31, leakage is prevented and the water stoppage is improved.

  Further, when the exhaust hole 5 is closed by the valve body 7, the protrusion 33 b is not in the same direction as the closing direction S (that is, the upward direction) of the valve body 7, but is in a specific direction A (that is, orthogonal to the closing direction S (that is, Since it is elastically deformed in a direction different from the closing direction S) and falls, the downward reaction force of the seal member 33 acting on the valve body 7 can be reduced. For example, the internal pressure of the valve box 2 is low and the valve body 7 Even when the pressing force in the closing direction S is small, the protrusion 33b is easily elastically deformed and falls down. Thereby, water-stopping property can fully be maintained. At this time, since the protrusion 33 b falls into the space 36, the valve body side seat surface 32 reliably contacts the valve seat side seat surface 31.

  Further, when the exhaust hole 5 is closed by the valve body 7 and the water filling is completed, the internal pressure of the valve box 2 is changed from the outer peripheral side of the protrusion 33b to the inner peripheral side (that is, from the inclined side to the opposite side). By acting in the direction, the protrusion 33b is pushed back from the falling direction to the standing direction B by the internal pressure. Therefore, as the internal pressure becomes higher, the pushing force in the standing direction B acting on the protruding portion 33b increases, and the protruding portion 33b is more strongly pressed against the valve seat side seat surface 31 by this pushing force. The self-water-stop function by 33b improves.

In the first embodiment, the seal member 33 is provided on the valve body 7, but may be provided on the valve seat 6.
Next, the structure and seal structure of a different type of air valve from the air valve 1 of the first embodiment will be described.
(Second Embodiment)
As shown in FIG. 3, the air valve 50 includes a guide cylinder 52, a float 53, and a floating valve body 54 in a valve box 51, and is connected to a pipe (not shown). A fluid inflow hole 55 communicating with the pipe is formed at the bottom of the valve box 51. The guide cylinder 52 has a lower opening 56 at the bottom, an upper opening 57 at the upper side of the side wall, and a valve seat 58 at the upper end. The valve seat 58 is fitted into and supported by the upper end portion of the valve box 51.

  A lid 59 is provided on the upper portion of the valve box 51, and an exhaust hole 60 (an example of a circulation hole) communicating with the inside of the guide tube 52 and the outside atmosphere is formed in the lid 59. The valve seat 58 is sandwiched and fixed between the upper end portion of the valve box 51 and the lid 59 and is formed so as to surround the periphery of the exhaust hole 60.

  The float 53 is formed in a spherical shape and is disposed in the guide tube 52 so as to be movable up and down. The floating valve body 54 has a small-diameter air hole 61 at the center and is placed on the float 53. The floating valve body 54 rises in the closing direction S due to the buoyancy of the float 53 and closes the exhaust hole 60. The small diameter air hole 61 communicates with both the upper and lower sides of the floating valve body 54, and a small diameter air hole valve seat 61 a is provided at the lower end opening of the small diameter air hole 61.

The seal structure between the floating valve body 54 and the valve seat 58 of the air valve 50 is configured as follows. In addition, about the same member as what was demonstrated previously, the same code | symbol is attached | subjected and description is abbreviate | omitted.
As shown in FIG. 4, a valve seat side seat surface 63 is formed on the lower end surface of the valve seat 58. The idle valve body 54 can approach and separate from the valve seat side seat surface 63 from the orthogonal direction (up and down direction), and has a valve body side seat surface 64 that can contact and separate from the valve seat side seat surface 63 from below. Have.

  An annular seal member 33 is provided on the valve seat 58. The seal member 33 is formed on the main body 33a, a protrusion 33b formed on the entire circumference near the inner periphery of the lower end (one end) of the main body 33a, and an upper portion (the other end) of the main body 33a. And a flange portion 33c protruding to the inner peripheral side. The protrusion 33b protrudes downward from the valve seat side seat surface 63 toward the valve body side seat surface 64.

  The valve seat 58 includes a valve seat body 58a and a ring-shaped presser member 58b provided on the inner peripheral edge of the valve seat body 58a. The pressing member 58b is attached to the valve seat body 58a by a plurality of screws 58c.

Hereinafter, the operation of the above configuration will be described.
Normally, as shown in FIG. 3, the float 53 and the floating valve element 54 are lowered. When the pipe is filled with water in this state, the air in the pipe flows into the valve box 51 from the fluid inflow hole 55. A large amount of air is exhausted from the exhaust hole 60 to the atmosphere via the upper opening 57 of the guide tube 52. When the exhausting is almost finished and water flows into the valve box 51, the water flows into the guide tube 52 from the lower opening 56 and the upper opening 57, the float 53 floats and the floating valve body 54 is closed. 4B, the valve body side seat surface 64 comes into contact with the valve seat side seat surface 63 and the exhaust hole 60 is closed by the idle valve body 54.

  At this time, the projecting portion 33b of the seal member 33 abuts on the valve element side seat surface 64 and elastically deforms and falls in the specific direction A, so that the floating valve element 54 and the valve seat 58 are relatively inclined to be fully closed. At this time, even if a gap is generated between the floating valve body 54 and the valve seat 58, the seal surface 34 of the protrusion 33b is in contact with the valve body side seat surface 64 as described above, so that leakage is prevented. Water stoppage is improved.

  Further, the downward reaction force of the seal member 33 acting on the floating valve body 54 can be reduced. For example, when the internal pressure of the valve box 51 is low and the pressing force in the closing direction S of the floating valve body 54 is small. Even if it exists, the said protrusion part 33b can be elastically deformed and falls down easily, and can thereby maintain water-proof enough.

  Further, when the exhaust hole 60 is closed by the idle valve body 54 and the water filling is completed, the internal pressure of the valve box 51 acts from the outer peripheral side to the inner peripheral side of the protruding portion 33b, so that the protruding portion 33b is The internal pressure is pushed back from the falling direction to the standing direction B, and the protrusion 33b is further strongly pressed against the valve element side seat surface 64 by the reversing force at this time, so that the self-water stopping function by the protrusion 33b is improved. When the exhaust hole 60 is closed by the floating valve body 54 as described above, the float 53 contacts the small diameter air hole valve seat 61a and closes the small diameter air hole 61.

  Next, when the air in the piping accumulates in the valve box 51, the liquid level is lowered and the float 53 is lowered. However, the floating valve body 54 does not descend because the internal pressure of the pipe acts on the lower surface thereof, and the exhaust hole 60 remains closed. As a result, the float 53 is spaced downward from the small diameter air hole valve seat 61a of the floating valve body 54 to open the small diameter air hole 61, and a small amount of air in the valve box 51 is exhausted from the small diameter air hole 61 into the atmosphere. Accordingly, when the liquid level in the valve box 51 rises, the float 53 rises and closes the small-diameter air hole 61.

In the second embodiment, the seal member 33 is provided on the valve seat 58, but may be provided on the floating valve body 54.
In the first and second embodiments, the tip of the protrusion 33b of the seal member 33 is pointed, but it may be formed round. Further, the protrusion 33b is inclined toward the outer peripheral side of the seal member 33, but may be inclined toward the inner peripheral side. In this case, when the protrusion 33b contacts the valve seat 6 or the floating valve element 54, the protrusion 33b falls to the inner peripheral side.

Next, another embodiment of the seal member 33 will be described.
(Third embodiment)
As shown in FIG. 5, an annular corner covering member 68 made of a material softer than the sealing member 33 (for example, sponge or the like) is formed at a corner portion between the main body portion 33 a of the sealing member 33 and the outer peripheral surface of the protruding portion 33 b. Is provided.

  According to this, by providing the corner covering member 68, foreign matters such as dust can be prevented from staying in the corner portion between the main body portion 33a of the seal member 33 and the outer peripheral surface of the protruding portion 33b.

In the third embodiment, the protrusion 33b is inclined toward the outer peripheral side of the seal member 33. However, when the protrusion 33b is inclined toward the inner peripheral side, the corner covering member 68 is connected to the main body 33a. What is necessary is just to provide in a corner part with the internal peripheral surface of the projection part 33b.
(Fourth embodiment)
As shown in FIG. 6, the protrusion 33b of the seal member 33 has a triangular cross-sectional shape in the vertical direction, and stands upright without being inclined. A groove 69 for tilting the protrusion 33b in the specific direction A (that is, the outer peripheral side) is formed in the main body 33a over the entire circumference. The upper surface of the groove 69 is open and is formed from the base of the protrusion 33b to the outer periphery of the protrusion 33b.

According to this, the protrusion 33b easily falls in the specific direction A when contacting the valve seat 6 (or the valve body 54). At this time, the protrusion 33 b falls into the groove 69.
In the fourth embodiment, the specific direction A in which the protrusion 33b falls is on the outer peripheral side, but may be on the inner peripheral side. In this case, the groove 69 may be formed from the base of the protrusion 33b to the inner peripheral side of the protrusion 33b.

  In each of the above embodiments, one protrusion 33b is formed on the seal member 33. However, a plurality of protrusions (for example, two protrusions 33b on the inner peripheral side and protrusion 33b on the outer peripheral side) are formed inside and outside. May be.

  In each of the above embodiments, the seal structure of the air valves 1 and 50 is shown, but the present invention may be applied to other types of valves other than the air valve.

It is an enlarged view of the seal structure of the air valve in the 1st Embodiment of this invention, (a) shows the state which opened the exhaust hole, (b) shows the state which closed the exhaust hole with the valve body. It is sectional drawing of the sealing member of the sealing structure of an air valve. It is a figure of the air valve provided with the seal structure in the 2nd Embodiment of this invention. It is an enlarged view of the sealing structure of an air valve, (a) shows the state which opened the exhaust hole, (b) shows the state which closed the exhaust hole with the valve body. It is sectional drawing of the sealing member of the seal structure in the 3rd Embodiment of this invention. It is sectional drawing of the sealing member of the seal structure in the 4th Embodiment of this invention. It is sectional drawing of the conventional air valve, and shows the state which opened the exhaust hole. It is sectional drawing of an air valve and shows the state which closed the exhaust hole with the valve body. It is sectional drawing of the conventional air valve, and provided the sealing member in the valve body. FIG. 4 is an enlarged view of the seal structure of the air valve, showing a state where the exhaust hole is closed with a valve body.

Explanation of symbols

1 Air valve 5 Exhaust hole (flow hole)
6 Valve seat 7 Valve body 33 Seal member 33b Protruding portion 50 Air valve 54 Floating valve body 58 Valve seat 60 Exhaust hole (flow hole)
A Specific direction S Close direction

Claims (2)

A valve seal structure in which the valve body is pressed against the valve seat by the force of fluid to close the flow hole,
The valve seat is formed so as to surround the circulation hole,
An annular seal member is fitted into a groove formed in either the valve body or the valve seat ,
The seal member has a protrusion that can freely come into contact with and separate from the valve seat or the valve body over the entire circumference.
The protruding portion is inclined to either the outer peripheral side or the inner peripheral side, and is configured to fall to the inclined side when contacting the valve seat or the valve body,
The internal pressure of the valve box acts from the inclined side of the protrusion to the opposite side,
The groove structure has a wall surface located adjacent to the protrusion and facing the protrusion from the side opposite to the internal pressure acting side . A valve seat side seat surface is formed on the valve seat,
The valve body has a valve body side seat surface that can freely come into contact with and separate from the valve seat side seat surface,
2. The valve seal structure according to claim 1, wherein a wall surface of the groove is orthogonal to the valve seat side seat surface or the valve body side seat surface .

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